/Engine/Plugins/Runtime/MassGameplay/Source/MassSpawner/Public/MassEntityTraitBase.h
Called when all Traits have hadBuildTemplate()called.
virtual void ValidateTemplate ( [FMassEntityTemplateBuildContext](API\Plugins\MassSpawner\FMassEntityTemplateBuildContext) & BuildContext, const [UWorld](API\Runtime\Engine\Engine\UWorld) & World ) const